body {

    /*background: aliceblue;*/
    background:whitesmoke;
}

* {
    margin: 0;
    padding: 0;
}

li {
    list-style-type: none;
    display: inline-block;
    margin: 20px;
}

.tab .tabs ul {

    font-size: 30px;
    font-weight: normal;
    padding-left: 150px;
    box-shadow: 10px 10px 10px -4px rgba(0, 0, 0, .3);
    /*background-color: #ffffff;*/
    background-color: black;
}

.tab .tabs ul li a {

    text-decoration: none;
    text-transform: uppercase;

    color: whitesmoke;
    position: relative;
}

.tab .tabs ul li a:before {

    content: '';
    width: 0px;
    height: 5px;
    background: whitesmoke;
    position: absolute;
    top: 100%;
    left: 0;
    transition: .5s;
}

.tab .tabs ul li:hover a:before {

    width: 50%;
    transform: translateX(100%);
}


.tab_dis .dis ul li {
    position: relative;
    height: 600px;
    width: 600px;
    /*background-color: #f8fbff;*/
    background-color: whitesmoke;
    box-shadow: 10px 10px 10px -4px rgba(0, 0, 0, .3);
}


.dis {
    display: none;
}